Manhole



- A. DAVIS, JR.

MANHOLE. APPLICATION FILLD JULY 22, I919.

1,329,040.- Patented Jan. 27,1920.

I HWE/VTUR 4 TTOR/VEY AUGUSTINE DAVIS, an, or covINGT0N, KENTUCKY.

MANHOLE.

Specification of Letters Patent.

Patented Jan. 27, 1920.

Original application filed June 22, 1914, Serial No. 846,444. Divided and this application filed July 22, 1919.

- Serial No. 312,530.

To all whom it may concern:

Be it known that I, AUGUSTINE DAVIS, J r., a citizen of the United States, and resident of Covington, in the county of Kenton and State of Kentucky, have invented a new and useful Manhole, of which the following is a specification.

Thls application 1s .a division of my application for oil wagon tanks, filed June 22,

In the accompanying drawings forming a part hereof:

Figure 1 i a. view partly in vertical section and partly in elevation of the manhole ring before bein welded into the manhole opening of the shell;

Fig. 2 is a sectional view of the manhole '25 portion of the shell flanged .out to receive the ring; and

Fig. 3 is a sectional view of the completed structurei The tank shell 1 is concavely flanged'out around the manhole opening 2, forming the tapered neck 7. The manhole ring 5 is inserted into the outer portion of the neck, and there secured by an oxyacetylene or like autogeneous weld 10, uniting the lapping portions at the edge of the neck. In this way the parts are made practically as one; but if a. simple ring were employed the results would iiot be satisfactory, since the thermal and contraction stresses would distort the internal screw 3 of the ring, so that the manhole cover would not fit. This difficulty i overcome by providing a manhole ring having two differentiated portions, that is to say a. relatively heavy or massive outer or upper portion containing the screw-thread, and an inner or lower portion 9 which is unthreaded and tapered on the interior to a relatively thin edge, and by utilizing the latter portion to receive the weld. As seen in Fig. 3 the screw collar of the ring is outside of the neck and beyond the weld, while the portion 9 laps the edge of the neck, where the weld 10 is formed by fusing the edge to the side of the portion with addition of molten metal, the edge of the portion 9 being left free.

Manholes constructed in this manner are light yet strong, relatively inexpensive to produce, and contain no joints through which liquid can escape or enter. The flanged-out neck affords structural strength and furnishes a. means of taking up contraction stresses and a region to which the ring can be successfully united and in which it is laterally supported. Furthermore, because of the ring being inserted into the neck, it is not'necessary that the top ofthe latter be made square, it being sufficient merely to flange it out, with such incidental variation in level at different part of the rim as may occur. Setting the ring down into the neck also avoids an undue amount of projection.

\Vhile the invention has been described as a. manhole, it will be understood that it is equally applicable to other openings, and that the term, manhole, is used generically. A filler opening may be four inches in diameter as against fourteen inches for a manhole; but the construction for each is identical.

lVhat I claim as new is:

1. A manhole construction comprising a flanged-out neck on a tank or shell, a manhole ring inserted into the neck, said ring having an outwardly projecting heavy threaded portion and an inner thin unthreaded portion lapping the edge of the neck, and an autogeneous weld uniting the parts at this region.

2. A manhole construction comprising a flanged-out tapered .neck on a tank or shell, a manhole ring inserted into the neck, said ring having an outer screw portion and an inner plain portion lapping the edge of the neck and tapered to a free thin edge within the neck, and an autogeneous weld uniting the edge of the neck and the side of the plain tapered portion of the rin AUcUsTinn Dr i is, JR. 

